package pgdp.iter;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Random;

public class PasswordIterator implements Iterator<String> {
	private static int passwordLength;

	public PasswordIterator(int passwordLength) {
		PasswordIterator.passwordLength = passwordLength;
		if (passwordLength < 1 || passwordLength > 9)
			Util.badArgument("Passwortlänge liegt im Intervall 1 bis 9");
	}

	public ArrayList<String> iterator(ArrayList<String> matched) {
		ArrayList<String> result = new ArrayList<String>();
		// Code1 that consists of repeating the same digit
		for (int i = 0; i < 10; i++) {
			Iterator<String> code1 = (Iterator<String>) new Range(i, i);
			while (result.size() <= passwordLength) {
				result.add(code1.next());
			}
		}
		// Code2 that represents an ascending sequence of digits
		for (int i = 0; i < 9; i++) {
			Iterator<String> code2 = (Iterator<String>) new Range(i, i + 1);
			while (result.size() <= passwordLength) {
				result.add(code2.next());
			}
		}
		// Codes that represents a descending sequence of digits
		for (int i = 9; i > 0; i--) {
			Iterator<String> code3 = (Iterator<String>) new Range(i, i - 1);
			while (result.size() <= passwordLength) {
				result.add(code3.next());
			}
		}
		matched = result; // mark the string result as matched
		// All other codes of the given length
		byte[] code4 = new byte[passwordLength];
		new Random().nextBytes(code4);
		String resultOfRandom = new String(code4, Charset.forName("UTF-8"));
		if (!isMatched(resultOfRandom))
			result.add(resultOfRandom);
		return result;
	}

	public static boolean isMatched(String result) {
		String[] matched = new String[100000];
		for (int i = 0; i < matched.length; i++) {
			if (matched[i].contains(result))
				return true;
		}
		return false;
	}

	@Override
	public boolean hasNext() {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public String next() {
		// TODO Auto-generated method stub
		return null;
	}

	public static void main(String[] args) {
		PasswordIterator iter = new PasswordIterator(4);
	}
}